o-Xylene, neat, Solvent-neat, Unit 1mL, # of units-1, Cas.no. 95-47-6

Ethynylestradiol (20,21-13C2,99%) 100 µg/mL in Acetonitrile, 1,2ml

Paraxanthine, neat, Solvent-neat, Unit 50mg, # of units-1, Cas.no. 611-59-6

Sulfamethoxazole-d4 (benzene-d4),100 µg/mL,MeOH,1mL